Abstract
Ba 8Mg(Nb 6− x Sb x )O 24 ( x = 0, 0.3, 0.6, 0.9, 1.2, 1.5, 1.8 and 2.4) ceramics were prepared through conventional solid-state route. The materials were calcined at 1200 °C and sintered at the optimized temperature of 1375 °C. The structure of the system was analyzed by X-ray diffraction, Fourier transform infrared and Raman spectroscopic methods. The theoretical and experimental densities were calculated. The dielectric constant ( ɛ r), temperature coefficient of resonant frequency ( τ f) and the unloaded quality factor ( Q u) were measured in the microwave frequency region using cavity resonator method. The τ f values of the samples reduced considerably with the increase in Sb concentration. The dielectric responses were studied in the frequency range 50 Hz to 5 MHz also. The microstructure of the sintered pellets was analyzed using scanning electron microscopy. The materials have intense emission lines in the visible region. The compositions have good microwave dielectric properties and photoluminescence and hence are suitable for dielectric resonator and ceramic laser applications.
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